Move libEGL to compile on all platforms.
Move libEGL to compile on all platforms.

BUG=angle:773

Change-Id: I377c6df9b1f10e2756b7f000099847dc910c965c
Reviewed-on: https://chromium-review.googlesource.com/232793
Reviewed-by: Brandon Jones <303ddc8529a3012e7fb187d611f08537af0cc183@chromium.org>
Reviewed-by: Kenneth Russell <1ebccd90c2bc76de65b6f830f2128a91ed69fdfb@chromium.org>
Tested-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

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